Standardize usage of virtual/override/final in remoting/

remoting/protocol/client_stub.h

Index: remoting/protocol/client_stub.h
diff --git a/remoting/protocol/client_stub.h b/remoting/protocol/client_stub.h
index d57f948d35ea36339c93a68f296d12f439b62545..6db7b91f7e8180a4d854d0c7a9cec94479a77f7b 100644
--- a/remoting/protocol/client_stub.h
+++ b/remoting/protocol/client_stub.h
@@ -25,7 +25,7 @@ class ClientStub : public ClipboardStub,
                    public CursorShapeStub {
  public:
   ClientStub() {}
-  virtual ~ClientStub() {}
+  ~ClientStub() override {}
 
   // Passes the set of capabilities supported by the host to the client.
   virtual void SetCapabilities(const Capabilities& capabilities) = 0;